package wyj;

import java.util.Scanner;

class Main555 {
    public static void main(String[] args){
        Scanner in = new Scanner(System.in );
        int r,s,i;
        String c,d;
        i = in.nextInt();
        c = "";
        d = "";
        if (i>=11&i<=59){
            s = i%10;
            r = i/10;
            switch (s){
                case 1:c="Faint signals, barely perceptible";break;
                case 2:c="Very weak signals";break;
                case 3:c="Weak signals";break;
                case 4:c="Fair signals";break;
                case 5:c="Fairly good signals";break;
                case 6:c="Good signals";break;
                case 7:c="Moderately strong signals";break;
                case 8:c="Strong signals";break;
                case 9:c="Extremely strong signals";break;
            }
            switch (r){
                case 1:d="unreadable";break;
                case 2:d="barely readable, occasional words distinguishable";break;
                case 3:d="readable with considerable difficulty";break;
                case 4:d="readable with practically no difficulty";break;
                case 5:d="perfectly readable";break;

            }


        }
        System.out.println(c+", "+d+".");



    }
}
